/* string 插入和删除 */
#include <string>
#include <iostream>

using namespace std;

int main(int argc, char **argv)
{
    string str1 = "hello";

    cout << str1 << endl;
    str1.erase(1, 1);
    cout << str1 << endl;
    str1.erase();
    cout << str1 << endl;






    return 0;
}